The following was found at the Australian War Memorial site 
(http://www.awm.gov.au) regarding the remains of Charles Ward at Jefferson Barracks:

ST LOUIS, MISSOURI, U.S.A. (SEE ALSO P00277.04, 02, 03, 04) JEFFERSON BARRACKS, 
NATIONAL CEMETERY. PLAQUE COMMEMORATING ALLIED PERSONNEL FROM THE U.S.A., 
GREAT BRITAIN, THE NETHERLANDS AND AUSTRALIA WHO GAVE THEIR LIVES IN WORLD 
WAR II, 1944-07 TO 1946-01. VX32696 PRIVATE CHARLES FREDERICK WARD OF 2/2 AND 2/40 
PIONEERS, AUSTRALIAN IMPERIAL FORCE, SERVED IN TIMOR AND THEN AS A POW ON THE 
BURMA-THAILAND RAILWAY. TOWARDS THE END OF 1944 HE WAS TRANSFERRED TO JAPAN 
WHERE HE DIED AS A MINER IN 1945. HE WAS CREMATED IN JAPAN TOGETHER WITH THE 
OTHERS LISTED ON THE PLAQUE, AND THE REMAINS DEPOSITED IN A SINGLE URN. AS THE 
MAJORITY WERE AMERICANS, THEIR EVENTUAL RESTING PLACE WAS NO. 1 COMMUNAL URN, 
JEFFERSON BARRACKS, NATIONAL CEMETERY, MISSOURI, U.S.A.

The Australian War Memorial site has an excellent search engine.

The Commonwealth War Graves Commission:
Locations of war dead for Australian, Canadian, Indian,  New Zealand, South African, 
and UK & former colonies (http://www.cwgc.org/) also has a most helpful search engine.